功能化碳纳米纤维增强芒硝基相变储能材料的热性能

doi:10.11896/cldb.21050177

材料导报

2022, Vol. 36

Issue (6): 21050177-7 https://doi.org/10.11896/cldb.21050177

无机非金属及其复合材料

功能化碳纳米纤维增强芒硝基相变储能材料的热性能

魏宁¹, 铁生年²

1 青海大学化工学院,西宁 810016
2 青海大学新能源光伏产业研究中心,西宁 810016

Functionalized Carbon Nanofibers Enhance the Thermal Properties of Glauber's Salt-based Phase Change Energy Storage Materials

WEI Ning¹, TIE Shengnian²

1 College of Chemical Engineering, Qinghai University, Xining 810016, China
2 New Energy (Photovoltaic) Industry Research Center, Qinghai University, Xining 810016, China

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摘要无机水合盐相变储能材料较低的导热系数导致了其缓慢的吸放热速率,限制了水合盐的实际应用。本工作以芒硝(Na₂SO₄·10H₂O)为相变材料、聚丙烯酸钠(PSA)为支撑材料,利用硼砂改善相变体系的过冷度,借助高导热的碳纳米纤维(CNFs)来提升复合相变材料的导热系数。从SEM图中可知,CNFs-Na₂SO₄·10H₂O/PSA被成功制备,且芒硝和功能化的CNFs嵌入到PSA形成的三维网络结构中。拉曼光谱和红外光谱的结果表明相变体系各组分之间具有良好的化学相容性。DSC曲线表明,聚丙烯酸钠与芒硝之间的相互作用使得体系相变行为得到调整,Na₂SO₄·10H₂O/PSA的熔融焓和结晶焓分别为197.2 J/g 和137.0 J/g。与Na₂SO₄·10H₂O/PSA相比,CNFs-Na₂SO₄·10H₂O/PSA的导热系数得到显著提升,固态热导率达到1.2 W/(m·K)左右,液态热导率达到1.0 W/(m·K)左右。此外,经过300次的循环试验,复合相变材料的熔融焓和结晶焓分别下降了23.3%、28.8%。

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	魏宁
	铁生年

关键词: 芒硝相变材料碳纳米纤维功能化相变行为导热系数

Abstract: The low thermal conductivity is a hindrance to salt hydrate as it leads to slow rates of heat absorption and release, which limits the practical application of inorganic hydrate salts. In this work, a series of Na₂SO₄·10H₂O/PSA composite materials with different weight ratios were fabricated by using the Na₂SO₄·10H₂O as phase change materials and polyacrylic acid sodium as a supporting materials, and by adding carbon nanofibers to enhance thermal conductivity. Scanning electron microscopy micrographs revealed that composite PCMs have been successfully prepared, and Na₂SO₄·10H₂O and functionalized carbon nanofibers are embedded in 3D networks of PSA, the above three materials bonding together to form a smooth network structure. FTIR and Raman spectra results indicated that there were no chemical interactions between components in phase transition system. Differential scanning calorimetry suggested that phase transition behavior of the system was adjusted by the interaction between polyacrylic acid sodium and Na₂SO₄·10H₂O, as melting and crystallization enthalpy are 197.2 J/g and 137.0 J/g, respectively. Compared with Na₂SO₄·10H₂O/PSA, thermal conductivity of CNFs-Na₂SO₄·10H₂O/PSA significantly increased, of which thermal conductivity of solid state reached about 1.2 W/(m·K) and thermal conductivity of liquid state was about 1.0 W/(m·K). Moreover, after 300 thermal cycles, melting and crystallization enthalpy of composite phase change materials decreased by 23.3% and 28.8% respectively.

Key words: Na₂SO₄·10H₂O phase change materials carbon nanofibers functional phase transition behaviors thermal conductivity

出版日期: 2022-03-25 发布日期: 2022-03-21

ZTFLH:	TQ12
	TB34

基金资助: 青海省自然基金项目(2020-ZJ-909);材料复合新技术国家重点实验室(武汉理工大学)开放基金项目(2020-KF-1)

通讯作者: tieshengnian@163.com

作者简介: 魏宁,青海大学应用化学专业研究生,主要研究方向为相变储能材料。
铁生年,教授,博士研究生导师,青海大学新能源光伏产业研究中心常务副主任;青海省先进材料与应用技术重点实验室主任;青海大学非金属材料研究所所长;中国优秀科技工作者。主要从事新能源材料、粉体材料、环境保护材料以及太阳能综合利用等方向的科学研究工作,撰写核心科技论文100余篇,获得授权中国专利30项,授权中国发明专利18项,荣获中国侨界贡献创新成果奖等荣誉。

引用本文:

魏宁, 铁生年. 功能化碳纳米纤维增强芒硝基相变储能材料的热性能[J]. 材料导报, 2022, 36(6): 21050177-7.
WEI Ning, TIE Shengnian. Functionalized Carbon Nanofibers Enhance the Thermal Properties of Glauber's Salt-based Phase Change Energy Storage Materials. Materials Reports, 2022, 36(6): 21050177-7.

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http://www.mater-rep.com/CN/10.11896/cldb.21050177 或 http://www.mater-rep.com/CN/Y2022/V36/I6/21050177

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